Malicious PDF — malware analysis report

Static analysis result for SHA-256 665536d6dfe5e737…

MALICIOUS

PDF

76.9 KB Created: 2021-01-29 08:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1a37d5acf83426c07716ac20c5f55476 SHA-1: d8a4d68f4d22f4bf9ac8542787c2f4e568846097 SHA-256: 665536d6dfe5e737774c2b4e9847c09dbd113d7747a55d61a27c06f347be9826
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to phishing sites. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=environmental+management+system+definition+iso PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ff51bdfe534f.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/Cgcifja/intelligence_health_bracelet_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/VsT4dPk/necromancer_druid_5e_build.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe939de426f0.pdfIn PDF document text
    • https://cdn.sqhk.co/gujamozulas/Ugfidfs/72698080587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_6008fa7511afa.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/umicxhb/get_likes_on_tiktok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibunagevidaze.rf.gd/chicago_marathon_tracker_android.pdfIn PDF document text
    • http://sarozaxag.epizy.com/dukoveluwesu.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/business_expenses_template_free.pdfIn PDF document text
    • http://tukurazetuxud.epizy.com/upvc_shiplap_cladding_sheets.pdfIn PDF document text
    • http://rukilokurotog.rf.gd/6504678825.pdfIn PDF document text
    • http://datonojafasaxup.rf.gd/computer_basic_full_form_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/respiracin_aerobia_y_anaerobia.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/zanonuranes.pdfIn PDF document text
    • http://fujesotes.epizy.com/idling_to_rule_the_gods_starting_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 5348 bytes
SHA-256: 52a997665b9784cb8ead94dbd88e8ce25428faeae2acc114b118a44fc86f288d
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 9656 bytes
SHA-256: a63d429151a9a5f297e516e5036b324a453942044028642acbe08d864f528926

Open this report in the interactive analyzer, or submit your own file for analysis.